<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="/static/bootstrap.css">

</head>
<body>
<div class="container mt-3">
    <div class="row" >
        <div class="col mt-3" style="background-color: #0dcaf0">1111</div>
    </div>

    <div class="row mt-3" >
        <div class="col" style="background-color: #ffc107">
            <div class="row">
                <div class="col">555</div>
            <div class="col" style="background-color: #6a1a21">4444</div>
            </div>

        </div>
    <div class="col" style="background-color: #0a53be">222</div>

    </div>

    <div class="row">
        <div class="col mt-3" style="background-color: #6a1a21">333</div>
    </div>
</div>

</body>
</html>